Finding the Fourth Proportional to 19,808.72, 29,665.72 and 9,916.88

Step by Step Solution

1. Step 1: Write the proportion equation
   19,808.72 : 29,665.72 = 9,916.88 : x
2. Step 2: Convert to fraction form
   19,808.72/29,665.72 = 9,916.88/x
3. Step 3: Cross multiply
   19,808.72x = 29,665.72 × 9,916.88
4. Step 4: Simplify right side
   19,808.72x = 294,191,385.35
5. Step 5: Solve for x
   x = 294,191,385.35/19,808.72
6. Step 6: Final answer
   x = 14,851.61